Improvement in sectional steam-boilers



'ing a series of pairs of tubes.

UNITED STATES APATNT OFFICE.

WILLIAM P. SKIFFINGTON, OF NEW YORK, N. Y.

IMPROVEMENT IN SEC'TIONAL STEAM-BOILERS.

Specification forming part of Letters Patent No. 177,757, dated May 23, 1876; application filed November 18, 1874.

' To all whom it may concern:

Beit known that I, WILLIAM P. SVKIFFING- TON, of New York, in the State of New York, have invented a new and useful Improvement in Sectional Steam-Boilers, of which the following is a specification 4 Figure I represents a longitudinal section of my improvement, with the general con struction of 'a boiler shown in dotted lines. Fig. II is a top view of the same.

rlhe nature of my invention consists in the construction of that part of a sectional steamboiler generally called Athe tube-head, by connecting a number of hollow chambers, open at top and bottom, by means of a central bolt, when each of said chambers is arranged to receive two tubes, whereby a 'greater area, and, consequently, a freer circulation, of water andsteam from the tubes through this tubehead is obtained than is possible when each chamber contains only one tube, as at present.

In the accompanying drawing, A A represent the sectional parts, which, when placed one above the other, form the tube-heads, into which the tubes P are screwed or fastened,

and constitute a connectingpipe of continuously equal area from end to end for connect- Each of such sections A is of a diameter largely exceeding its length, which is, preferably, only' suflicient to afford the space commonly required to receive the tubes P. Such tubes are ar. ranged in pairs in the several sections A, at one side ot' the center of the connecting-pipe, which they collectively form, and said sections, as' they are successively laid up in forming tbc connecting-pipe, are placed in reversed position alternately, in order that the tubes of 011e section shall lie partially over the space formed between those-of the section next beneath, thus ei'ecting what is known as the staggered arrangement ofthe tubes,whereby the tube-surface is more eectually presented to theflames. These sectional parts A are i' fastened together by a single bolt, a, set in with two openings, c c, closed bysuitable plates in the usual manner for hand-holes or mud-holes, and for the purpose of cleaning the tubes. Instead of two openings, c c, one oblong opening may bemade, if desired.

In sectional tube'boilers the tubes are generally four inches in diameter, and seven inches from center'to center. By the usualV present arrangement of making one of the sectional parts A to contain one tube, they are sixand three-fourths inches outside diameter, which, less the facing for the joint, equal to seveneighths all around, gives an opening ofgiive inches; equal to an area of 19.64 inches, from which deduct the area of the one. and a halt' inch bolt, equalA to 1.77 inch, leaves-an effective area of 17.87 inches. The area 'of a four- -inch tube is 12.56 inches; consequently we get in this case not quite one and one-half times the area of the tube for circulation through this tube-head.

times the area of the two tubes without inl' creasing or alteringthe usual established ,dimensions of this description of sectional boilers. A

It will be seen with my invention that the chambers or rings A are all on a horizontal.

line, while the tubes P are all on an. incline.

What l claim as my invention, and desire to secure by Letters Patent, is v A tube-head, consisting of a section of a pipe, whose diameter exceeds the length of each section, in combination with a pair of tubes arranged at one side of the diametrical center of such section, substantially as described.

WILLIAM P. VWitnesses:

HENRY E. ROEDER, E. ScHULER. l

SKIFFINGTON. 

